Natural vocalizations from unseen bird within 1m of ground in understory of subtropical cloudforest along road on slope. Playback did not cause any visible movement. Sounds rather jay-like, but I'm quite certain it was in the low understory, which seems uncharacteristic of any jay in the area (even Cyanolyca cucullata seems to only descend so low in gaps with thick vegetation, this was in understory under complete canopy). I'm out of ideas. Anyone?